289666879 has 2 divisors, whose sum is σ = 289666880. Its totient is φ = 289666878.

The previous prime is 289666873. The next prime is 289666903. The reversal of 289666879 is 978666982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 289666879 - 2⁹ = 289666367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289666873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144833439 + 144833440.

It is an arithmetic number, because the mean of its divisors is an integer number (144833440).

Almost surely, 2^289666879 is an apocalyptic number.

289666879 is a deficient number, since it is larger than the sum of its proper divisors (1).

289666879 is an equidigital number, since it uses as much as digits as its factorization.

289666879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 61.

The square root of 289666879 is about 17019.6027861992. The cubic root of 289666879 is about 661.6570536524.

The spelling of 289666879 in words is "two hundred eighty-nine million, six hundred sixty-six thousand, eight hundred seventy-nine".